Progressive Policy doesn't come out and say that education turns
people into Democrats–the chart doesn't show the effect of higher
education over time on individuals, just the state by state
differences. But for every one percentage point increase in
college graduates in a state, the percentage of people who
identify themselves as Democrats increases by 0.75
percent.

The folks at Progressive Policy do say this:

The more college graduates, the more Democratic (and
especially more liberal) the state. The fewer college graduates,
the more Republican and (and especially more conservative) the
state.

Anyway, take that for what it is worth. The charts essentially
tell you what you already knew: liberal states like New York and
Massachusetts invest more in educating their kids. Conservative
states like Kansas and Texas spend less on it, and consequently
have fewer people with bachelor's degrees.

Check out the rest of the charts showing the correlation between
education investment and liberalism over
at Progressive Policy.